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// Copyright (C) 2017 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.server.schema;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.GerritPersonIdent;
import com.google.gerrit.server.config.AllUsersName;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;
import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.jgit.lib.CommitBuilder;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.RefUpdate.Result;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevSort;
import org.eclipse.jgit.revwalk.RevWalk;
/**
* Make sure that for every account a user branch exists that has an initial empty commit with the
* registration date as commit time.
*
* <p>For accounts that don't have a user branch yet the user branch is created with an initial
* empty commit that has the registration date as commit time.
*
* <p>For accounts that already have a user branch the user branch is rewritten and an initial empty
* commit with the registration date as commit time is inserted (if such a commit doesn't exist
* yet).
*/
public class Schema_146 extends SchemaVersion {
private static final String CREATE_ACCOUNT_MSG = "Create Account";
private final GitRepositoryManager repoManager;
private final AllUsersName allUsersName;
private final PersonIdent serverIdent;
@Inject
Schema_146(
Provider<Schema_145> prior,
GitRepositoryManager repoManager,
AllUsersName allUsersName,
@GerritPersonIdent PersonIdent serverIdent) {
super(prior);
this.repoManager = repoManager;
this.allUsersName = allUsersName;
this.serverIdent = serverIdent;
}
@Override
protected void migrateData(ReviewDb db, UpdateUI ui) throws OrmException, SQLException {
try (Repository repo = repoManager.openRepository(allUsersName);
RevWalk rw = new RevWalk(repo);
ObjectInserter oi = repo.newObjectInserter()) {
ObjectId emptyTree = emptyTree(oi);
for (Map.Entry<Account.Id, Timestamp> e : scanAccounts(db).entrySet()) {
String refName = RefNames.refsUsers(e.getKey());
Ref ref = repo.exactRef(refName);
if (ref != null) {
rewriteUserBranch(repo, rw, oi, emptyTree, ref, e.getValue());
} else {
createUserBranch(repo, oi, emptyTree, e.getKey(), e.getValue());
}
}
} catch (IOException e) {
throw new OrmException("Failed to rewrite user branches.", e);
}
}
private void rewriteUserBranch(
Repository repo,
RevWalk rw,
ObjectInserter oi,
ObjectId emptyTree,
Ref ref,
Timestamp registeredOn)
throws IOException {
ObjectId current = createInitialEmptyCommit(oi, emptyTree, registeredOn);
rw.reset();
rw.sort(RevSort.TOPO);
rw.sort(RevSort.REVERSE, true);
rw.markStart(rw.parseCommit(ref.getObjectId()));
RevCommit c;
while ((c = rw.next()) != null) {
if (isInitialEmptyCommit(emptyTree, c)) {
return;
}
CommitBuilder cb = new CommitBuilder();
cb.setParentId(current);
cb.setTreeId(c.getTree());
cb.setAuthor(c.getAuthorIdent());
cb.setCommitter(c.getCommitterIdent());
cb.setMessage(c.getFullMessage());
cb.setEncoding(c.getEncoding());
current = oi.insert(cb);
}
oi.flush();
RefUpdate ru = repo.updateRef(ref.getName());
ru.setExpectedOldObjectId(ref.getObjectId());
ru.setNewObjectId(current);
ru.setForceUpdate(true);
ru.setRefLogIdent(serverIdent);
ru.setRefLogMessage(getClass().getSimpleName(), true);
Result result = ru.update();
if (result != Result.FORCED) {
throw new IOException(
String.format("Failed to update ref %s: %s", ref.getName(), result.name()));
}
}
public void createUserBranch(
Repository repo,
ObjectInserter oi,
ObjectId emptyTree,
Account.Id accountId,
Timestamp registeredOn)
throws IOException {
ObjectId id = createInitialEmptyCommit(oi, emptyTree, registeredOn);
String refName = RefNames.refsUsers(accountId);
RefUpdate ru = repo.updateRef(refName);
ru.setExpectedOldObjectId(ObjectId.zeroId());
ru.setNewObjectId(id);
ru.setRefLogIdent(serverIdent);
ru.setRefLogMessage(CREATE_ACCOUNT_MSG, false);
Result result = ru.update();
if (result != Result.NEW) {
throw new IOException(String.format("Failed to update ref %s: %s", refName, result.name()));
}
}
private ObjectId createInitialEmptyCommit(
ObjectInserter oi, ObjectId emptyTree, Timestamp registrationDate) throws IOException {
PersonIdent ident = new PersonIdent(serverIdent, registrationDate);
CommitBuilder cb = new CommitBuilder();
cb.setTreeId(emptyTree);
cb.setCommitter(ident);
cb.setAuthor(ident);
cb.setMessage(CREATE_ACCOUNT_MSG);
return oi.insert(cb);
}
private boolean isInitialEmptyCommit(ObjectId emptyTree, RevCommit c) {
return c.getParentCount() == 0
&& c.getTree().equals(emptyTree)
&& c.getShortMessage().equals(CREATE_ACCOUNT_MSG);
}
private static ObjectId emptyTree(ObjectInserter oi) throws IOException {
return oi.insert(Constants.OBJ_TREE, new byte[] {});
}
private Map<Account.Id, Timestamp> scanAccounts(ReviewDb db) throws SQLException {
try (Statement stmt = newStatement(db);
ResultSet rs = stmt.executeQuery("SELECT account_id, registered_on FROM accounts")) {
HashMap<Account.Id, Timestamp> m = new HashMap<>();
while (rs.next()) {
m.put(new Account.Id(rs.getInt(1)), rs.getTimestamp(2));
}
return m;
}
}
}
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